The saxion is the scalar superpartner of the
axion, and part of a
chiral superfield. The axion represents the CP violating theory of the Standard Model. The axion and saxion are examples of the
scalar boson
A scalar boson is a boson whose spin equals zero. ''Boson'' means that the particle's wave function is symmetric under particle exchange and therefore follows Bose–Einstein statistics. The spin-statistics theorem implies that all bosons have ...
class of particles with a very small mass, and a charge of 0.
Hypothetical elementary particles
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